body {
	position: fixed;
	width: 100%;
	height: 100%;
}

.contenenr {
	width: 100%;
	height: 100%;
	position: absolute;
	display: flex;
	justify-content: center;
	align-items: center;
}

.contenenr_out {
	width: 90%;
}

.contenenr_out>div:nth-child(1) {
	display: flex;
	justify-content: center;
	align-items: center;
	font-size: 2rem;
	padding: 80px 0;
}

.contenenr_down {
	display: flex;
	justify-content: center;
	align-items: center;
}

.contenenr_down>div {
	border: 1px solid gray;
	margin: 20px;
	cursor: pointer;
}

.contenenr_down>div>img {
	width: 300px;
}

.contenenr_down>div:nth-child(3) img {
	transform: scale(.5);
}

/* 底部导航 */
.navigation {
	display: flex;
	justify-content: center;
	align-items: center;
	position: absolute;
	width: 100%;
	bottom:0;
}

.navigation>div {
	padding: 30px 15px;
	cursor: pointer;
}

@media (max-width: 1200px) {
	.contenenr_down>div>img {
		width: 200px;
	}
}
@media (max-width: 720px){
	.contenenr_down{
		flex-wrap: wrap;
	}
	.contenenr{
		 position: relative; overflow-y: scroll;
	}
}
@media (max-width: 550px){
	.contenenr_down>div:nth-child(3){
		display: none;
	}
}